A good heatsink/thermal paste will work just as good as liquid coolers. I was always a fan of zalman fans and artic silver thermal compound. Of course your case will play a big roll in how air moves through your case to cool your components

Agreed with Darren. Many decent air coolers perform as well or even better than many AIO's. This is partly due to companies trying to cash in on water cooling and many AIO's are poor quality and cheap, properly made water cooling systems should always perform better than air cooling.

Another perk of air coolers is that they typically are more quiet. Pumps on AIOs tend to make a fair amount of noise.
I'd suggest the BeQuiet Dark Rock 4 or even the Dark Rock Pro 4 if you really want a beefy boy.